sudo apt install -y virtualbox

wget „http://download.virtualbox.org/virtualbox/5.1.22/Oracle_VM_VirtualBox_Extension_Pack-5.1.22-115126.vbox-extpack“
sudo VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-5.1.22-115126.vbox-extpack

wget „http://download.virtualbox.org/virtualbox/5.0.40/Oracle_VM_VirtualBox_Extension_Pack-5.0.40-115130.vbox-extpack“
sudo VBoxManage extpack install –replace Oracle_VM_VirtualBox_Extension_Pack-5.0.40-115130.vbox-extpack
logout ???
vboxmanage list extpacks

sudo usermod -a -G vboxusers $USER

# don’t miss the „quote’s
wget -O newfilename.ova „http://…..“
md5sum blah.ova

# -n (–dryrun)
vboxmanage import -n –vsys 0 –memory 1024 -unit 7 –ignore –cpus 1 –unit 8 –ignore –vmname sc126 blah.ova
vboxmanage import –vsys 0 –memory 1024 -unit 7 –ignore –cpus 1 –unit 8 –ignore –vmname sc126 blah.ova